A method is provided for identifying multidimensional parameters of a plurality of P>1 sources of interest present in a predetermined multidimensional conductive environment by a plurality of observations (60) in a finite number of N.gtoreq.1. The method includes using i) a factorisation of a problem matrix formulation, ii) the creation of a virtual network of the order 2q (q>1) sensors by using cumulants of order 2q from observations and iii) the concept of an extended deflation of order 2q taking into consideration the presence of potentially (but not entirely) correlated sources. The method and device can be used for electroencephalograpy, magnetoencephalography, geophysics and seismology.